feat: Phase 5.1 - Client 扩展，添加 orchestrator 依赖

- 扩展 Client 结构体，添加 sessionManager、orchestrator、cancelFuncs 字段
- 创建 WSClient 适配器实现 orchestrator.Sender 接口
- 更新 ServeWS 函数签名，接收 orchestrator 参数
- 在 main.go 中初始化 AI 服务和 Orchestrator

backend/cmd/server/main.go

@@ -10,8 +10,12 @@ import (
 
 	"github.com/gin-gonic/gin"
 
+	"github.com/hhs/camtalk/internal/ai/llm"
+	"github.com/hhs/camtalk/internal/ai/stt"
+	"github.com/hhs/camtalk/internal/ai/tts"
 	"github.com/hhs/camtalk/internal/config"
 	"github.com/hhs/camtalk/internal/logger"
+	"github.com/hhs/camtalk/internal/orchestrator"
 	"github.com/hhs/camtalk/internal/session"
 	"github.com/hhs/camtalk/internal/ws"
 )
@@ -40,6 +44,14 @@ func main() {
 	sessionMgr = session.NewMemoryManager(30*time.Minute, 20)
 	defer sessionMgr.(*session.MemoryManager).Stop()
 
+	// 初始化 AI 服务
+	sttService := stt.NewDeepgramService(cfg.AI.STT.APIKey, cfg.AI.STT.Endpoint, logger.Log)
+	llmService := llm.NewOpenAIService(cfg.AI.LLM.APIKey, cfg.AI.LLM.Model, cfg.AI.LLM.Endpoint, cfg.AI.LLM.Timeout, logger.Log)
+	ttsService := tts.NewOpenAIService(cfg.AI.TTS.APIKey, cfg.AI.TTS.Voice, cfg.AI.TTS.Endpoint, cfg.AI.TTS.Speed, cfg.AI.TTS.Timeout, logger.Log)
+
+	// 初始化 Orchestrator
+	orch := orchestrator.New(sttService, llmService, ttsService, sessionMgr)
+
 	// Gin 模式
 	if cfg.App.Env == "prod" {
 		gin.SetMode(gin.ReleaseMode)
@@ -55,7 +67,7 @@ func main() {
 	}
 
 	// WebSocket
-	r.GET("/ws", ws.ServeWS(sessionMgr))
+	r.GET("/ws", ws.ServeWS(sessionMgr, orch))
 
 	// HTTP Server
 	srv := &http.Server{